1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 42Get this manual
Loosen the screw and pull out the joint rod from the accelerator armNext, remove the pin and the accelerator arm 2Carburetor aChecking fuel and air passages Check the carburetor body, its parts and the fuel and air passages for fouling or cloggingClean fouled parts with suitable cleaning solvent and blowout clogged passages with compressed air
1Joint rod
2Accelerator arm
Cleaning, inspection and rapair 1Fuel pump aChecking diaphragms Check the diaphragms for breakage, stretches or deformation and replace them as requiredbChecking check valves Check the check valves for cracks or chips and replace them as required'